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首页> 外文期刊>Materials Science and Engineering >Microstructural evolution and deformation mechanism of a Fe-15Mn alloy investigated by electron back-scattered diffraction and transmission electron microscopy
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Microstructural evolution and deformation mechanism of a Fe-15Mn alloy investigated by electron back-scattered diffraction and transmission electron microscopy

机译：电子背散射衍射和透射电子显微镜研究Fe-15Mn合金的组织演变和变形机理

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摘要

The present studies focus on mechanical properties and microstructure evolution of a Fe-15Mn dual phase alloy during tensile deformation based on the analyses of X-ray diffraction, electron back-scattered diffraction and transmission electron microscopy. The alloy possesses excellent combination of strength and ductility (UTS × TEL = 32 GPa·%) and good strain hardening capacity owing to several plastic deformation mechanisms. At earlier stage of tensile deformation, the deformation induced transformation from y to e is the main plastic deformation mechanism. In addition, the deformation induced twins within e-martensite and transformation from ε to α' also have contributions to the plastic deformation. With further increasing the strain, the deformation induced transformation from ε→α' in combination with the dislocation slip in γ, ε and α' become the main plastic deformation mechanisms. During the whole tensile deformation, nearly all α'-martensite grains exist within ε-martensite plates, indicating that the deformation induced transformation sequence is ε→α'. Moreover, it has been demonstrated that the a'-martensite is preferred to nucleate at intersections of two ε-martensite plates, interfaces of γ/ε and ε/ε and low angle grain boundaries within ε-martensite plates. Note that the orientations of some α'-martensite grains existing within the same ε-martensite plate are not exactly the same.
机译：基于X射线衍射，电子背散射衍射和透射电子显微镜的分析，本研究集中于拉伸变形过程中Fe-15Mn双相合金的力学性能和组织演变。由于多种塑性变形机制，该合金具有优异的强度和延展性（UTS×TEL = 32 GPa·％）的组合，并具有良好的应变硬化能力。在拉伸变形的早期，变形引起的从y到e的转变是主要的塑性变形机制。此外，电子马氏体中形变引起的孪晶以及从ε到α'的转变也对塑性变形有贡献。随着应变的进一步增加，由ε→α'引起的形变转变以及γ，ε和α'中的位错滑移成为主要的塑性变形机制。在整个拉伸变形过程中，几乎所有的α'-马氏体晶粒都存在于ε-马氏体平板内，表明变形引起的相变顺序为ε→α'。此外，已经证明α-马氏体优选在两个ε-马氏体板的相交处成核，γ/ε和ε/ε的界面以及ε-马氏体板内的低角度晶界。注意，存在于同一ε-马氏体平板中的某些α'-马氏体晶粒的取向并不完全相同。

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